25.4μm Kapton-like #polyimide tape (half silicone adhesive, half polyimide film), rated for 1500V (118kV/mm gives a number of 2997V in 25.4μm but maybe they’re not counting the adhesive), dielectric constant 4.0, rated for 260°.
#PDF spec sheet for Kapton-brand #polyimide, which comes in 7.5 μm, 12.7 μm, 25.4 μm, 50.8 μm, 76.2 μm and 127 μm. They test it by hanging it in a 400° oven for 1½–2 hours, which is pretty fucking hardcore, though UL rates it for much lower temperatures (200° to 240°), and you can heat-seal it at 350°. Its tensile strength is 165MPa, high for a mere organic polymer. Dielectric constant 3.4. 118–236kV/mm dielectric strength.
they're prosecuting Natalie Rupnow’s father for letting her have a gun. #USA #crime